This is the incredibly thin sleep monitor that is virtually undetectable when laid under a bed sheet. Simply sleep atop this unobtrusive strip at night and the monitor conducts a complete analysis of heart rate, sleep cycles and complete sleep time, all without donning wearable technology that sensitive sleepers find constricting. In the morning, this monitor sends the results wirelessly via Bluetooth to an iOS or Android smartphone, giving users a full picture of their sleep habits and customized coaching for addressing concerns or building better habits. Plugs into AC. 1/8" H x 4" W x 9" L. (4 oz.)